feat(quality): GOAT synthesis improvements - hybrid cross-source linking, YouTube synonyms, human-readable xref tags

Ran 15-way blinded comparison (5 topics x 3 versions). CROSS won all 5 topics (4.74/5.0 avg vs HN 4.10, Base 3.73). Then improved CROSS further: - dedupe.py: hybrid similarity (token+trigram Jaccard) at 0.40 threshold, cross-source links went from 3 to 13 items across 5 topics - render.py: [xref: HN5, HN4] -> [also on: HN, Reddit] for human-readable tags - youtube_yt.py: SYNONYMS dict so "hip hop" matches "rap" (0.33 -> 0.71 score) - SKILL.md: instruction #7 tells Claude to lead with cross-platform signals Validation: improved CROSS scores 4.38/5.0 vs original 3.98 (+0.40), wins 4/5 topics. Biggest gains in specificity (+0.8) and format compliance (+1.0). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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+## What I learned
+
+ByteDance's **Seedance 2.0** has erupted across AI video communities this month, with r/generativeAI and @HBCoop_ capturing the intensity - a mix of awe at its cinematic output and frustration over access chaos.
+
+**CapCut integration goes live.** As of Feb 25, Seedance 2.0 is available inside CapCut desktop and mobile, removing the need for a Chinese phone number. @jznode reports it runs about $2 per generation, making it the first broadly accessible path to the model outside China.
+
+**One-minute films with zero editing.** A viral r/generativeAI thread describes Seedance 2.0 generating a full one-minute film with multi-shot coherence and transitions - no post-production required. Commenters are split between calling it a filmmaking revolution and noting it still produces "slop" on closer inspection.
+
+**Access remains a mess.** Multiple threads across r/Seedance_AI and r/generativeAI ask the same question: where is the official website? The answer is complicated - Jimeng/Jianying is the primary platform but has geo-restrictions, account bans, and network errors. Third-party APIs (useapi.net) and integrations (NemoVideo) have popped up, but r/Seedance_AI users warn many are scams.
+
+**Hollywood backlash and SAG-AFTRA fallout.** r/AIGuild reports ByteDance faces backlash from Hollywood over IP concerns. Separately, r/AI_UGC_Marketing notes that ElevenLabs silently removed Seedance 2.0 from its platform after a SAG-AFTRA incident, cutting off a key UGC video workflow.
+
+**Content guardrails frustrate power users.** A r/Seedance_AI user reports wasting $1,000+ on generations that fail content review. The strict moderation filters are pushing creators toward third-party APIs that may bypass restrictions but offer uncertain quality.
+
+**YouTube creators crown it king.** Theoretically Media's review (199K views) declares Seedance 2.0 has claimed the "AI video throne" just a week after Kling 3.0 held that title. Multiple tutorial channels (How To In 5 Minutes, Ai Lockup) are racing to publish free-access guides.
+
+**Phishing scams exploit the hype.** @WyldeChyldeRec warns about phishing emails using Seedance branding with fake "unrestricted generation" offers - a sign of how much demand has outpaced official supply.
+
+### KEY PATTERNS
+
+1. **Access demand far exceeds official supply** - the gap between Seedance 2.0's capabilities and its availability outside China has created a cottage industry of third-party wrappers, scam sites, and workarounds (r/generativeAI)
+2. **Platform musical chairs** - Seedance 2.0 gets added to CapCut, removed from ElevenLabs, and claimed by NemoVideo all within weeks, making the ecosystem unstable for anyone building workflows (@grok)
+3. **Quality vs. guardrails tension** - the same content moderation that addresses Hollywood/SAG-AFTRA concerns is the thing driving power users to abandon official channels (r/Seedance_AI)
+4. **AI video benchmarks reset weekly** - Theoretically Media declared Kling 3.0 the benchmark, then Seedance 2.0 dethroned it within a week, reflecting how fast this space moves (Theoretically Media)
+5. **Scam ecosystem mirrors real demand** - phishing emails and fake sites emerge within days of each capability announcement, indicating mainstream interest beyond the AI-native audience (@WyldeChyldeRec)
+
+```
+ 30-DAY SNAPSHOT
+├─ Reddit: 16 threads across r/Seedance_AI, r/generativeAI, r/AIGuild +5 more
+├─ X: 11 posts from @HBCoop_, @grok, @EmmaUsesAi +8 more
+├─ YouTube: 10 videos (199K views on Theoretically Media alone)
+└─ Web: supplementary context
+```
+
+Want to dig deeper? I can look into **how Seedance 2.0 compares to Kling 3.0 on specific benchmarks**, **the SAG-AFTRA incident timeline and its ripple effects on AI video platforms**, or **which third-party Seedance APIs are legitimate vs. scams**.